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Infineon Technologies MMBTA42LT1HTSA1
- Part No.:
- MMBTA42LT1HTSA1
- Manufacturer:
- Infineon Technologies
- Category:
- Single Bipolar Transistors
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
MMBTA42LT1HTSA1.pdf
- Description:
- TRANS NPN 300V 0.5A PG-SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:7,477
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Product details
Overview
MMBTA42LT1HTSA1 from Infineon Technologies is an NPN silicon high-voltage transistor in SOT-23 package, rated for VCEO = 300 V, IC = 500 mA, and Ptot = 360 mW at TS ≤ 74 °C. It delivers low VCE(sat) = 0.5 V (IC = 20 mA, IB = 2 mA) and hFE ≥ 25 at IC = 1 mA, supporting high-voltage switching in automotive ignition and flyback converter primary-side drivers.
For engineers reviewing the MMBTA42LT1HTSA1 datasheet, MMBTA42LT1HTSA1 pinout, MMBTA42LT1HTSA1 application, or MMBTA42LT1HTSA1 equivalent, key selection criteria include verified high-voltage breakdown (VCEO/VCBO = 300 V), thermal resistance RthJS ≤ 210 K/W, complementary PNP pairing with MMBTA92, RoHS-compliant SOT-23 packaging, and AEC-Q101 qualification for automotive use.
Technical Context
This discrete NPN bipolar junction transistor operates in linear or saturated switching mode with a guaranteed minimum DC current gain of 25 at IC = 1 mA and VCE = 10 V, rising to 40 at IC = 10 mA. Its high-voltage capability stems from epitaxial base design enabling 300 V collector-emitter and collector-base breakdown ratings under specified test conditions.
The device exhibits fT = 50–70 MHz at IC = 10 mA, VCE = 20 V, and f = 100 MHz, with Ccb = 3 pF at VCB = 20 V, making it suitable for medium-frequency switching rather than RF amplification. Thermal derating follows a defined Ptot vs. TS curve, with full power only permissible below 74 °C case temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 300 V - supports operation in 230 VAC line-referred circuits with safety margin |
| IC | 500 mA - enables driving moderate-current loads such as relay coils or small solenoids |
| VCE(sat) | ≤ 0.5 V @ IC = 20 mA, IB = 2 mA - minimizes conduction loss in saturated switch applications |
| hFE | 25–40 - provides predictable base drive requirements across operating current range |
| fT | 50–70 MHz - sufficient for kHz-range switching control, not RF signal amplification |
| RthJS | ≤ 210 K/W - defines maximum junction-to-solder-point temperature rise per watt dissipated |
| AEC-Q101 | Qualified - validated for automotive underhood temperature cycling, humidity, and mechanical stress |
Pinout & Package
MMBTA42LT1HTSA1 is housed in a standard SOT-23 plastic surface-mount package with gull-wing leads, footprint compatible with JEDEC TO-236AB. Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector - confirmed by Infineon's official package outline and marking layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Base) | Control input | Receives forward-biased current to turn on transistor; requires series resistor to limit IB ≤ 100 mA |
| 2 (Emitter) | Current return path | Connected to ground or low-side reference; forms common-emitter configuration with collector load |
| 3 (Collector) | High-voltage output node | Switches up to 300 V loads; must be isolated from logic-level circuitry via optocoupler or level-shifting driver |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | VCEO = VCBO = 300 V enables direct interface with 230 VAC mains-derived rails |
| Low saturation voltage | VCE(sat) ≤ 0.5 V reduces power loss and self-heating during on-state conduction |
| AEC-Q101 qualification | Validated for automotive underhood environments including temperature cycling and mechanical shock |
| Pb-free RoHS compliance | Meets EU Directive 2011/65/EU; no lead content in terminations or mold compound |
| Complementary PNP pair | MMBTA92 shares identical package, ratings, and thermal profile for push-pull designs |
Applications
| Automotive Ignition Coils | Flyback Converter Primary Switch |
|---|---|
Use Scenario: Driving primary winding of inductive ignition coil in 12 V vehicle systems. IC Role / Device Role / Timing Role: High-voltage NPN switch turning on/off coil current to generate spark voltage pulses. Use Value: 300 V VCEO withstands flyback spikes >250 V; low VCE(sat) limits heat generation during dwell time. | Use Scenario: Primary-side switching element in isolated AC/DC flyback power supplies for industrial sensors. IC Role / Device Role / Timing Role: Fast-turning-on transistor controlling energy storage in transformer primary during PWM cycle. Use Value: fT ≥ 50 MHz ensures adequate gain at switching frequencies up to 100 kHz; AEC-Q101 rating supports harsh environment reliability. |
| High-Voltage Relay Drivers | Line-Voltage Surge Protection Circuits |
Use Scenario: Amplifying microcontroller GPIO signals to energize 24–48 VDC relay coils with inductive kickback. IC Role / Device Role / Timing Role: Medium-current, high-voltage interface transistor isolating logic from coil back-EMF. Use Value: IC = 500 mA handles typical relay coil currents; VEBO = 6 V allows safe base-emitter reverse bias during transient suppression. | Use Scenario: Clamping transient overvoltage on 230 VAC input lines using active crowbar topology. IC Role / Device Role / Timing Role: Fast-acting high-voltage switch triggered by overvoltage detection to short line to ground. Use Value: VCEO = 300 V exceeds peak AC line voltage (≈325 V); low Ccb = 3 pF minimizes capacitive coupling into control circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BC817-40,215 (Nexperia) | VCEO = 45 V, IC = 500 mA, hFE = 250–630 - lower voltage rating, higher gain | Not suitable for >45 V circuits; better for low-voltage logic-level switching | Select only if system voltage remains ≤45 V and higher hFE reduces base drive burden |
| ZTX653 (Diodes Inc.) | VCEO = 300 V, IC = 1 A, Ptot = 1 W - same voltage, higher current/power, TO-92 package | Requires through-hole mounting; larger footprint but higher thermal mass | Choose when >500 mA load current or improved thermal handling is required, accepting larger board area |
Compared with BC817-40 and ZTX653, MMBTA42LT1HTSA1 uniquely balances 300 V capability, SOT-23 compactness, AEC-Q101 qualification, and automotive-grade reliability-making it optimal for space-constrained, high-voltage automotive and industrial switching where leaded alternatives or lower-voltage transistors fall short.
Availability
MMBTA42LT1HTSA1 is available at Aetrix Electronics and suitable for automotive ignition modules, industrial flyback power supplies, high-voltage relay drivers, and line-voltage surge protection circuits requiring stable component supply and long-term manufacturability.
Supply support for MMBTA42LT1HTSA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs and discrete devices.
MMBTA42LT1HTSA1 belongs to Infineon's high-voltage bipolar transistor product line, designed specifically for robust, AEC-Q101-qualified switching in automotive and industrial power interfaces where voltage endurance and thermal reliability are critical.
FAQ
What is the maximum continuous collector current for MMBTA42LT1HTSA1?
The absolute maximum continuous collector current is 500 mA at case temperature ≤74 °C. Derating applies above this temperature per the Ptot vs. TS curve; at 100 °C case temperature, maximum usable IC drops to approximately 300 mA to maintain safe junction temperature.
Is MMBTA42LT1HTSA1 pin-compatible with MMBTA92?
No - MMBTA42LT1HTSA1 (NPN) and MMBTA92 (PNP) share identical SOT-23 package and pinout (1=B, 2=E, 3=C), but their polarity is opposite. They are complementary types, not drop-in replacements; swapping them without circuit redesign will cause functional failure.
Does MMBTA42LT1HTSA1 require a heatsink in typical applications?
Not typically - its RthJS ≤ 210 K/W and Ptot = 360 mW allow adequate self-cooling on standard FR-4 PCBs with 1 cm² copper pour. Heatsinking becomes necessary only in sealed enclosures above 70 °C ambient or when dissipating >250 mW continuously.
Can MMBTA42LT1HTSA1 be used in linear amplifier configurations?
It is not optimized for linear amplification. While hFE and fT support basic small-signal gain, its high VCEO and relatively high Ccb make it less suitable than dedicated RF or audio transistors. It is engineered and qualified for switching, not analog linearity or low-noise performance.
MMBTA42LT1HTSA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 300 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 2mA, 20mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 30mA, 10V
- Power - Max:
- 360 mW
- Frequency - Transition:
- 70MHz
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PG-SOT23
MMBTA42LT1HTSA1 FAQ
1.How can I place an order for MMBTA42LT1HTSA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for MMBTA42LT1HTSA1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MMBTA42LT1HTSA1 reliable?
The price and inventory of MMBTA42LT1HTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA42LT1HTSA1 is usually 5 days.
3.What payment methods are accepted for MMBTA42LT1HTSA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA42LT1HTSA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MMBTA42LT1HTSA1?
MMBTA42LT1HTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MMBTA42LT1HTSA1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MMBTA42LT1HTSA1?
For technical support, including MMBTA42LT1HTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA42LT1HTSA1 requirements.
6.How does Aetrix verify that MMBTA42LT1HTSA1 is sourced from the original manufacturer or authorized distributors?
All MMBTA42LT1HTSA1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMBTA42LT1HTSA1 meets industry standards.
7.What is the process for return or replacement of MMBTA42LT1HTSA1?
All MMBTA42LT1HTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA42LT1HTSA1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MMBTA42LT1HTSA1 part is unused and in its original packaging.
Return procedure for MMBTA42LT1HTSA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MMBTA42LT1HTSA1 Tags
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BC846BLT1G
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BC847B,215
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